气相色谱法测定芹菜中伏杀硫磷的不确定度评定

目的 为了评定气相色谱法对芹菜中伏杀硫磷的测量不确定度。方法 本研究采用气相色谱法测定出阳性芹菜中伏杀硫磷的含量,分析检测全过程和不确定度来源,建立气相色谱法测定蔬菜中伏杀硫磷不确定度评定的数学模型。结果 影响芹菜中伏杀硫磷不确定度大小的顺序为样品体积>标准液测定>样品液测定标准溶液配置>样品称量,合成标准不确定度为3.12%,本次样品浓度为0.131±0.008mg/kg(k=2)。结论 选择精准度越高的定容器皿,能有效降低测量不确定度。

Uncertainty evaluation for the determination of phosalone in the celery by gas chromatography

Objective In order to evaluate the uncertainty of phosalone in the celery by gas chromatography.. Methods In this study, the content of phosalone in positive celery was determined by gas chromatography , the whole process of detection and the source of uncertainty were analyzed, and a mathematical model for the uncertainty evaluation of phosalone in vegetables was established by gas chromatography. Results The order affecting the uncertainty of phosalone in the celery is > standard solution determination of > sample solution determination of standard solution > sample weighing, and the uncertainty of synthesis standard is 3.12%. The concentration of this sample is 0.131±0.008mg/kg (k=2).Conclusion The higher the accuracy of the selection of the container dish, can effectively reduce the uncertainty of measurement.